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                    Introduction
            
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                    2.进程管理之进程与线程
            
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                    4.进程管理之进程同步
            
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                    5.内存管理之基本概念
            
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                    6.内存管理之虚拟内存
            
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                    8.面试题总结一
            
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                    1.计算机网络入门文章(必读)
            
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                    2.计算机网络通信入门文章(必读)
            
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                    3.数据链路层
            
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                    4.网络层(一)
            
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                    5.网络层(二)
            
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                    6.传输层
            
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                    7.应用层(⭐)
            
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                    8.HTTP相关及发展
            
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                    9.websocket
            
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                    面试题总结一
            
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                    1.图论
            
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                    2.图论例题
            
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                    3.散列表
            
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                    4.排序算法
            
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                    5.排序算法例题
            
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                    6.树论
            
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                    数据结构模板
            
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                    leetCode周赛记录
            
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                    1.时间复杂度
            
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                    2.深度优先搜索算法
            
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                    2.深搜题目集
            
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                    3.广度优先搜索算法
            
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                    1.jvm内存结构
            
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                    3.对象存亡与垃圾收集算法.md
            
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                    4.HotSpot的算法细节与垃圾收集器.md
            
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                    7.类加载机制.md
            
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                    8.逃逸分析技术
            
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                    1.多线程学习路线图
            
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                    2.java内存模型与线程
            
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                    2.并行程序基础
            
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                    3.happenBefore与jvm指令重排序
            
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                    4.synchronized与volatile.md
            
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                    5.ThreadLocal.md
            
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                    6.乐观锁与悲观锁.md
            
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                    7.CAS与atomic类.md
            
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                    8.AQS.md
            
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                    9.基于AQS的并发工具.md
            
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                    10.阻塞队列.md
            
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                    11.线程池与底层原理.md
            
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        <li class="chapter " data-level="6.13" data-path="../多线程/10面试题一.html">
            
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                    12.面试题一
            
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                    13.面试题二.md
            
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                    1.集合架构
            
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                    2.hashMap底层原理
            
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                    3.ConcurrentHashMap分析
            
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                    1.创造型模式
            
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                    三种工厂模式
            
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                    实战工厂模式
            
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                    实战抽象工厂模式
            
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                <a href="../数据库/mysql/1.b树b+树的底层原理.html">
            
                    
                    1.mysql索引基础之b树与b+树⭐⭐
            
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        <li class="chapter " data-level="9.2" data-path="../数据库/mysql/2.mysql索引.html">
            
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                    2.mysql索引及优化⭐⭐⭐⭐
            
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        <li class="chapter " data-level="9.3" data-path="../数据库/mysql/3.mysql存储引擎.html">
            
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                    3.mysql存储引擎.md
            
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        <li class="chapter " data-level="9.4" data-path="../数据库/mysql/4.多版本并发控制之mvcc原理.html">
            
                <a href="../数据库/mysql/4.多版本并发控制之mvcc原理.html">
            
                    
                    4.多版本并发控制之mvcc原理
            
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        <li class="chapter " data-level="9.5" data-path="../数据库/mysql/4.mysql事务.html">
            
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                    5.mysql事务
            
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                    6.mysql的锁机制
            
                </a>
            

            
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                    7.mysql面试题一
            
                </a>
            

            
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        <li class="header">高并发中间件篇</li>
        
        
    

    
        
        <li class="header">架构理论篇</li>
        
        
    
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                    1.架构演进
            
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                    2.微服务架构与soa架构
            
                </a>
            

            
        </li>
    

    
        
        <li class="header">高可用系统篇</li>
        
        
    
        <li class="chapter " data-level="12.1" data-path="../高可用架构/1.限流.html">
            
                <a href="../高可用架构/1.限流.html">
            
                    
                    1.系统限流
            
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                    2.服务熔断
            
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        <li class="chapter " data-level="12.3" data-path="../高可用系统/3.服务降级.html">
            
                <a href="../高可用系统/3.服务降级.html">
            
                    
                    3.服务降级
            
                </a>
            

            
        </li>
    

    
        
        <li class="header">spring-cloud 微服务篇</li>
        
        
    

    

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<p>&#x7B2C;&#x4E00;&#x6BB5;&#x7F16;&#x8BD1;&#x5C31;&#x662F;<code>javac</code>&#x547D;&#x4EE4;&#x3002;</p>
<p>&#x5728;&#x7B2C;&#x4E8C;&#x7F16;&#x8BD1;&#x9636;&#x6BB5;&#xFF0C;JVM &#x901A;&#x8FC7;&#x89E3;&#x91CA;&#x5B57;&#x8282;&#x7801;&#x5C06;&#x5176;&#x7FFB;&#x8BD1;&#x6210;&#x5BF9;&#x5E94;&#x7684;&#x673A;&#x5668;&#x6307;&#x4EE4;&#xFF0C;&#x9010;&#x6761;&#x8BFB;&#x5165;&#xFF0C;&#x9010;&#x6761;&#x89E3;&#x91CA;&#x7FFB;&#x8BD1;&#x3002;&#x5F88;&#x663E;&#x7136;&#xFF0C;&#x7ECF;&#x8FC7;&#x89E3;&#x91CA;&#x6267;&#x884C;&#xFF0C;&#x5176;&#x6267;&#x884C;&#x901F;&#x5EA6;&#x5FC5;&#x7136;&#x4F1A;&#x6BD4;&#x53EF;&#x6267;&#x884C;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x5B57;&#x8282;&#x7801;&#x7A0B;&#x5E8F;&#x6162;&#x5F88;&#x591A;&#x3002;&#x8FD9;&#x5C31;&#x662F;&#x4F20;&#x7EDF;&#x7684;JVM&#x7684;&#x89E3;&#x91CA;&#x5668;&#xFF08;Interpreter&#xFF09;&#x7684;&#x529F;&#x80FD;&#x3002;&#x4E3A;&#x4E86;&#x89E3;&#x51B3;&#x8FD9;&#x79CD;&#x6548;&#x7387;&#x95EE;&#x9898;&#xFF0C;&#x5F15;&#x5165;&#x4E86; JIT&#xFF08;&#x5373;&#x65F6;&#x7F16;&#x8BD1;&#xFF09; &#x6280;&#x672F;&#x3002;</p>
<p>&#x5F15;&#x5165;&#x4E86; JIT &#x6280;&#x672F;&#x540E;&#xFF0C;Java&#x7A0B;&#x5E8F;&#x8FD8;&#x662F;&#x901A;&#x8FC7;&#x89E3;&#x91CA;&#x5668;&#x8FDB;&#x884C;&#x89E3;&#x91CA;&#x6267;&#x884C;&#xFF0C;&#x5F53;JVM&#x53D1;&#x73B0;&#x67D0;&#x4E2A;&#x65B9;&#x6CD5;&#x6216;&#x4EE3;&#x7801;&#x5757;&#x8FD0;&#x884C;&#x7279;&#x522B;&#x9891;&#x7E41;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5C31;&#x4F1A;&#x8BA4;&#x4E3A;&#x8FD9;&#x662F;&#x201C;&#x70ED;&#x70B9;&#x4EE3;&#x7801;&#x201D;&#xFF08;Hot Spot Code)&#x3002;&#x7136;&#x540E;JIT&#x4F1A;&#x628A;&#x90E8;&#x5206;&#x201C;&#x70ED;&#x70B9;&#x4EE3;&#x7801;&#x201D;&#x7FFB;&#x8BD1;&#x6210;&#x672C;&#x5730;&#x673A;&#x5668;&#x76F8;&#x5173;&#x7684;&#x673A;&#x5668;&#x7801;&#xFF0C;&#x5E76;&#x8FDB;&#x884C;&#x4F18;&#x5316;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x628A;&#x7FFB;&#x8BD1;&#x540E;&#x7684;&#x673A;&#x5668;&#x7801;&#x7F13;&#x5B58;&#x8D77;&#x6765;&#xFF0C;&#x4EE5;&#x5907;&#x4E0B;&#x6B21;&#x4F7F;&#x7528;&#x3002;</p>
<p>JIT&#x4F18;&#x5316;&#x4E2D;&#x6700;&#x91CD;&#x8981;&#x7684;&#x4E00;&#x4E2A;&#x5C31;&#x662F;&#x9003;&#x9038;&#x5206;&#x6790;&#x3002;</p>
<h3 id="&#x9003;&#x9038;&#x5206;&#x6790;"><a name="&#x9003;&#x9038;&#x5206;&#x6790;" class="anchor-navigation-ex-anchor" href="#&#x9003;&#x9038;&#x5206;&#x6790;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="&#x9003;&#x9038;&#x5206;&#x6790;" class="plugin-anchor" href="#&#x9003;&#x9038;&#x5206;&#x6790;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x9003;&#x9038;&#x5206;&#x6790;</h3>
<p>&#x9003;&#x9038;&#x5206;&#x6790;&#x7684;&#x57FA;&#x672C;&#x884C;&#x4E3A;&#x5C31;&#x662F;&#x5206;&#x6790;&#x5BF9;&#x8C61;&#x52A8;&#x6001;&#x4F5C;&#x7528;&#x57DF;&#xFF1A;&#x5F53;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x5728;&#x65B9;&#x6CD5;&#x4E2D;&#x88AB;&#x5B9A;&#x4E49;&#x540E;&#xFF0C;&#x5B83;&#x53EF;&#x80FD;&#x88AB;&#x5916;&#x90E8;&#x65B9;&#x6CD5;&#x6240;&#x5F15;&#x7528;&#xFF0C;&#x4F8B;&#x5982;&#x4F5C;&#x4E3A;&#x8C03;&#x7528;&#x53C2;&#x6570;&#x4F20;&#x9012;&#x5230;&#x5176;&#x4ED6;&#x5730;&#x65B9;&#x4E2D;&#xFF0C;&#x79F0;&#x4E3A;&#x65B9;&#x6CD5;&#x9003;&#x9038;&#x3002;</p>
<p>&#x4F8B;&#x5982;&#x4EE5;&#x4E0B;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code>public static StringBuffer craeteStringBuffer(String s1, String s2) {
    StringBuffer sb = new StringBuffer();
    sb.append(s1);
    sb.append(s2);
    return sb;
}

public static String createStringBuffer(String s1, String s2) {
    StringBuffer sb = new StringBuffer();
    sb.append(s1);
    sb.append(s2);
    return sb.toString();
}
</code></pre><p>&#x7B2C;&#x4E00;&#x6BB5;&#x4EE3;&#x7801;&#x4E2D;&#x7684;<code>sb</code>&#x5C31;&#x9003;&#x9038;&#x4E86;&#xFF0C;&#x800C;&#x7B2C;&#x4E8C;&#x6BB5;&#x4EE3;&#x7801;&#x4E2D;&#x7684;<code>sb</code>&#x5C31;&#x6CA1;&#x6709;&#x9003;&#x9038;&#x3002;</p>
<p>&#x4F7F;&#x7528;&#x9003;&#x9038;&#x5206;&#x6790;&#xFF0C;&#x7F16;&#x8BD1;&#x5668;&#x53EF;&#x4EE5;&#x5BF9;&#x4EE3;&#x7801;&#x505A;&#x5982;&#x4E0B;&#x4F18;&#x5316;&#xFF1A;</p>
<p>&#x4E00;&#x3001;&#x540C;&#x6B65;&#x7701;&#x7565;&#x3002;&#x5982;&#x679C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x88AB;&#x53D1;&#x73B0;&#x53EA;&#x80FD;&#x4ECE;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x88AB;&#x8BBF;&#x95EE;&#x5230;&#xFF0C;&#x90A3;&#x4E48;&#x5BF9;&#x4E8E;&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#x7684;&#x64CD;&#x4F5C;&#x53EF;&#x4EE5;&#x4E0D;&#x8003;&#x8651;&#x540C;&#x6B65;&#x3002;</p>
<p>&#x4E8C;&#x3001;&#x5C06;&#x5806;&#x5206;&#x914D;&#x8F6C;&#x5316;&#x4E3A;&#x6808;&#x5206;&#x914D;&#x3002;&#x5982;&#x679C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x5728;&#x5B50;&#x7A0B;&#x5E8F;&#x4E2D;&#x88AB;&#x5206;&#x914D;&#xFF0C;&#x8981;&#x4F7F;&#x6307;&#x5411;&#x8BE5;&#x5BF9;&#x8C61;&#x7684;&#x6307;&#x9488;&#x6C38;&#x8FDC;&#x4E0D;&#x4F1A;&#x9003;&#x9038;&#xFF0C;&#x5BF9;&#x8C61;&#x53EF;&#x80FD;&#x662F;&#x6808;&#x5206;&#x914D;&#x7684;&#x5019;&#x9009;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x5806;&#x5206;&#x914D;&#x3002;</p>
<p>&#x4E09;&#x3001;&#x5206;&#x79BB;&#x5BF9;&#x8C61;&#x6216;&#x6807;&#x91CF;&#x66FF;&#x6362;&#x3002;&#x6709;&#x7684;&#x5BF9;&#x8C61;&#x53EF;&#x80FD;&#x4E0D;&#x9700;&#x8981;&#x4F5C;&#x4E3A;&#x4E00;&#x4E2A;&#x8FDE;&#x7EED;&#x7684;&#x5185;&#x5B58;&#x7ED3;&#x6784;&#x5B58;&#x5728;&#x4E5F;&#x53EF;&#x4EE5;&#x88AB;&#x8BBF;&#x95EE;&#x5230;&#xFF0C;&#x90A3;&#x4E48;&#x5BF9;&#x8C61;&#x7684;&#x90E8;&#x5206;&#xFF08;&#x6216;&#x5168;&#x90E8;&#xFF09;&#x53EF;&#x4EE5;&#x4E0D;&#x5B58;&#x50A8;&#x5728;&#x5185;&#x5B58;&#xFF0C;&#x800C;&#x662F;&#x5B58;&#x50A8;&#x5728;CPU&#x5BC4;&#x5B58;&#x5668;&#x4E2D;&#x3002;</p>
<p>&#x5728;Java&#x4EE3;&#x7801;&#x8FD0;&#x884C;&#x65F6;&#xFF0C;&#x901A;&#x8FC7;JVM&#x53C2;&#x6570;&#x53EF;&#x6307;&#x5B9A;&#x662F;&#x5426;&#x5F00;&#x542F;&#x9003;&#x9038;&#x5206;&#x6790;&#xFF0C;</p>
<p><code>-XX:+DoEscapeAnalysis</code> &#xFF1A; &#x8868;&#x793A;&#x5F00;&#x542F;&#x9003;&#x9038;&#x5206;&#x6790;</p>
<p><code>-XX:-DoEscapeAnalysis</code> &#xFF1A; &#x8868;&#x793A;&#x5173;&#x95ED;&#x9003;&#x9038;&#x5206;&#x6790; &#x4ECE;jdk 1.7&#x5F00;&#x59CB;&#x5DF2;&#x7ECF;&#x9ED8;&#x8BA4;&#x5F00;&#x59CB;&#x9003;&#x9038;&#x5206;&#x6790;&#xFF0C;&#x5982;&#x9700;&#x5173;&#x95ED;&#xFF0C;&#x9700;&#x8981;&#x6307;&#x5B9A;-XX:-DoEscapeAnalysis</p>
<h3 id="&#x540C;&#x6B65;&#x7701;&#x7565;"><a name="&#x540C;&#x6B65;&#x7701;&#x7565;" class="anchor-navigation-ex-anchor" href="#&#x540C;&#x6B65;&#x7701;&#x7565;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="&#x540C;&#x6B65;&#x7701;&#x7565;" class="plugin-anchor" href="#&#x540C;&#x6B65;&#x7701;&#x7565;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x540C;&#x6B65;&#x7701;&#x7565;</h3>
<p>&#x5728;&#x52A8;&#x6001;&#x7F16;&#x8BD1;&#x540C;&#x6B65;&#x5757;&#x7684;&#x65F6;&#x5019;&#xFF0C;JIT&#x7F16;&#x8BD1;&#x5668;&#x53EF;&#x4EE5;&#x501F;&#x52A9;&#x9003;&#x9038;&#x5206;&#x6790;&#x6765;&#x5224;&#x65AD;&#x540C;&#x6B65;&#x5757;&#x6240;&#x4F7F;&#x7528;&#x7684;&#x9501;&#x5BF9;&#x8C61;&#x662F;&#x5426;&#x53EA;&#x80FD;&#x591F;&#x88AB;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x8BBF;&#x95EE;&#x800C;&#x6CA1;&#x6709;&#x88AB;&#x53D1;&#x5E03;&#x5230;&#x5176;&#x4ED6;&#x7EBF;&#x7A0B;&#x3002;</p>
<p>&#x5982;&#x679C;&#x540C;&#x6B65;&#x5757;&#x6240;&#x4F7F;&#x7528;&#x7684;&#x9501;&#x5BF9;&#x8C61;&#x901A;&#x8FC7;&#x8FD9;&#x79CD;&#x5206;&#x6790;&#x88AB;&#x8BC1;&#x5B9E;&#x53EA;&#x80FD;&#x591F;&#x88AB;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x8BBF;&#x95EE;&#xFF0C;&#x90A3;&#x4E48;JIT&#x7F16;&#x8BD1;&#x5668;&#x5728;&#x7F16;&#x8BD1;&#x8FD9;&#x4E2A;&#x540C;&#x6B65;&#x5757;&#x7684;&#x65F6;&#x5019;&#x5C31;&#x4F1A;&#x53D6;&#x6D88;&#x5BF9;&#x8FD9;&#x90E8;&#x5206;&#x4EE3;&#x7801;&#x7684;&#x540C;&#x6B65;&#x3002;&#x8FD9;&#x4E2A;&#x53D6;&#x6D88;&#x540C;&#x6B65;&#x7684;&#x8FC7;&#x7A0B;&#x5C31;&#x53EB;&#x540C;&#x6B65;&#x7701;&#x7565;&#xFF0C;&#x4E5F;&#x53EB;<strong>&#x9501;&#x6D88;&#x9664;</strong></p>
<p>&#x5982;&#x4EE5;&#x4E0B;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code>public void f() {
    Object hollis = new Object();
    synchronized(hollis) {
        System.out.println(hollis);
    }
}
</code></pre><p>&#x4EE3;&#x7801;&#x4E2D;&#x5BF9;hollis&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#x8FDB;&#x884C;&#x52A0;&#x9501;&#xFF0C;&#x4F46;&#x662F;hollis&#x5BF9;&#x8C61;&#x7684;&#x751F;&#x547D;&#x5468;&#x671F;&#x53EA;&#x5728;f()&#x65B9;&#x6CD5;&#x4E2D;&#xFF0C;&#x5E76;&#x4E0D;&#x4F1A;&#x88AB;&#x5176;&#x4ED6;&#x7EBF;&#x7A0B;&#x6240;&#x8BBF;&#x95EE;&#x5230;&#xFF0C;&#x6240;&#x4EE5;&#x5728;JIT&#x7F16;&#x8BD1;&#x9636;&#x6BB5;&#x5C31;&#x4F1A;&#x88AB;&#x4F18;&#x5316;&#x6389;&#x3002;&#x4F18;&#x5316;&#x6210;&#xFF1A;</p>
<pre><code>public void f() {
    Object hollis = new Object();
    System.out.println(hollis);
}
</code></pre><p>&#x6240;&#x4EE5;&#xFF0C;&#x5728;&#x4F7F;&#x7528;synchronized&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5982;&#x679C;JIT&#x7ECF;&#x8FC7;&#x9003;&#x9038;&#x5206;&#x6790;&#x4E4B;&#x540E;&#x53D1;&#x73B0;&#x5E76;&#x65E0;&#x7EBF;&#x7A0B;&#x5B89;&#x5168;&#x95EE;&#x9898;&#x7684;&#x8BDD;&#xFF0C;&#x5C31;&#x4F1A;&#x505A;&#x9501;&#x6D88;&#x9664;&#x3002;</p>
<h3 id="&#x6807;&#x91CF;&#x66FF;&#x6362;"><a name="&#x6807;&#x91CF;&#x66FF;&#x6362;" class="anchor-navigation-ex-anchor" href="#&#x6807;&#x91CF;&#x66FF;&#x6362;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="&#x6807;&#x91CF;&#x66FF;&#x6362;" class="plugin-anchor" href="#&#x6807;&#x91CF;&#x66FF;&#x6362;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x6807;&#x91CF;&#x66FF;&#x6362;</h3>
<p>&#x6807;&#x91CF;&#xFF08;Scalar&#xFF09;&#x662F;&#x6307;&#x4E00;&#x4E2A;&#x65E0;&#x6CD5;&#x518D;&#x5206;&#x89E3;&#x6210;&#x66F4;&#x5C0F;&#x7684;&#x6570;&#x636E;&#x7684;&#x6570;&#x636E;&#x3002;Java&#x4E2D;&#x7684;&#x539F;&#x59CB;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x5C31;&#x662F;&#x6807;&#x91CF;&#x3002;&#x76F8;&#x5BF9;&#x7684;&#xFF0C;&#x90A3;&#x4E9B;&#x8FD8;&#x53EF;&#x4EE5;&#x5206;&#x89E3;&#x7684;&#x6570;&#x636E;&#x53EB;&#x505A;&#x805A;&#x5408;&#x91CF;&#xFF08;Aggregate&#xFF09;&#xFF0C;Java&#x4E2D;&#x7684;&#x5BF9;&#x8C61;&#x5C31;&#x662F;&#x805A;&#x5408;&#x91CF;&#xFF0C;&#x56E0;&#x4E3A;&#x4ED6;&#x53EF;&#x4EE5;&#x5206;&#x89E3;&#x6210;&#x5176;&#x4ED6;&#x805A;&#x5408;&#x91CF;&#x548C;&#x6807;&#x91CF;&#x3002;</p>
<p>&#x5728;JIT&#x9636;&#x6BB5;&#xFF0C;&#x5982;&#x679C;&#x7ECF;&#x8FC7;&#x9003;&#x9038;&#x5206;&#x6790;&#xFF0C;&#x53D1;&#x73B0;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x4E0D;&#x4F1A;&#x88AB;&#x5916;&#x754C;&#x8BBF;&#x95EE;&#x7684;&#x8BDD;&#xFF0C;&#x90A3;&#x4E48;&#x7ECF;&#x8FC7;JIT&#x4F18;&#x5316;&#xFF0C;&#x5C31;&#x4F1A;&#x628A;&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#x62C6;&#x89E3;&#x6210;&#x82E5;&#x5E72;&#x4E2A;&#x5176;&#x4E2D;&#x5305;&#x542B;&#x7684;&#x82E5;&#x5E72;&#x4E2A;&#x6210;&#x5458;&#x53D8;&#x91CF;&#x6765;&#x4EE3;&#x66FF;&#x3002;&#x8FD9;&#x4E2A;&#x8FC7;&#x7A0B;&#x5C31;&#x662F;&#x6807;&#x91CF;&#x66FF;&#x6362;&#x3002;</p>
<pre><code>public static void main(String[] args) {
   alloc();
}

private static void alloc() {
   Point point = new Point&#xFF08;1,2&#xFF09;;
   System.out.println(&quot;point.x=&quot;+point.x+&quot;; point.y=&quot;+point.y);
}
class Point{
    private int x;
    private int y;
}
</code></pre><p>&#x4EE5;&#x4E0A;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;point&#x5BF9;&#x8C61;&#x5E76;&#x6CA1;&#x6709;&#x9003;&#x9038;&#x51FA;<code>alloc</code>&#x65B9;&#x6CD5;&#xFF0C;&#x5E76;&#x4E14;point&#x5BF9;&#x8C61;&#x662F;&#x53EF;&#x4EE5;&#x62C6;&#x89E3;&#x6210;&#x6807;&#x91CF;&#x7684;&#x3002;&#x90A3;&#x4E48;&#xFF0C;JIT&#x5C31;&#x4F1A;&#x4E0D;&#x4F1A;&#x76F4;&#x63A5;&#x521B;&#x5EFA;Point&#x5BF9;&#x8C61;&#xFF0C;&#x800C;&#x662F;&#x76F4;&#x63A5;&#x4F7F;&#x7528;&#x4E24;&#x4E2A;&#x6807;&#x91CF;int x &#xFF0C;int y&#x6765;&#x66FF;&#x4EE3;Point&#x5BF9;&#x8C61;&#x3002;</p>
<p>&#x4EE5;&#x4E0A;&#x4EE3;&#x7801;&#xFF0C;&#x7ECF;&#x8FC7;&#x6807;&#x91CF;&#x66FF;&#x6362;&#x540E;&#xFF0C;&#x5C31;&#x4F1A;&#x53D8;&#x6210;&#xFF1A;</p>
<pre><code>private static void alloc() {
   int x = 1;
   int y = 2;
   System.out.println(&quot;point.x=&quot;+x+&quot;; point.y=&quot;+y);
}
</code></pre><p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#xFF0C;Point&#x8FD9;&#x4E2A;&#x805A;&#x5408;&#x91CF;&#x7ECF;&#x8FC7;&#x9003;&#x9038;&#x5206;&#x6790;&#x540E;&#xFF0C;&#x53D1;&#x73B0;&#x4ED6;&#x5E76;&#x6CA1;&#x6709;&#x9003;&#x9038;&#xFF0C;&#x5C31;&#x88AB;&#x66FF;&#x6362;&#x6210;&#x4E24;&#x4E2A;&#x805A;&#x5408;&#x91CF;&#x4E86;&#x3002;&#x90A3;&#x4E48;&#x6807;&#x91CF;&#x66FF;&#x6362;&#x6709;&#x4EC0;&#x4E48;&#x597D;&#x5904;&#x5462;&#xFF1F;&#x5C31;&#x662F;&#x53EF;&#x4EE5;&#x5927;&#x5927;&#x51CF;&#x5C11;&#x5806;&#x5185;&#x5B58;&#x7684;&#x5360;&#x7528;&#x3002;&#x56E0;&#x4E3A;&#x4E00;&#x65E6;&#x4E0D;&#x9700;&#x8981;&#x521B;&#x5EFA;&#x5BF9;&#x8C61;&#x4E86;&#xFF0C;&#x90A3;&#x4E48;&#x5C31;&#x4E0D;&#x518D;&#x9700;&#x8981;&#x5206;&#x914D;&#x5806;&#x5185;&#x5B58;&#x4E86;&#x3002;</p>
<p>&#x6807;&#x91CF;&#x66FF;&#x6362;&#x4E3A;&#x6808;&#x4E0A;&#x5206;&#x914D;&#x63D0;&#x4F9B;&#x4E86;&#x5F88;&#x597D;&#x7684;&#x57FA;&#x7840;&#x3002;</p>
<h3 id="&#x6808;&#x4E0A;&#x5206;&#x914D;"><a name="&#x6808;&#x4E0A;&#x5206;&#x914D;" class="anchor-navigation-ex-anchor" href="#&#x6808;&#x4E0A;&#x5206;&#x914D;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="&#x6808;&#x4E0A;&#x5206;&#x914D;" class="plugin-anchor" href="#&#x6808;&#x4E0A;&#x5206;&#x914D;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x6808;&#x4E0A;&#x5206;&#x914D;</h3>
<p>&#x5728;Java&#x865A;&#x62DF;&#x673A;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;&#x662F;&#x5728;Java&#x5806;&#x4E2D;&#x5206;&#x914D;&#x5185;&#x5B58;&#x7684;&#xFF0C;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x666E;&#x904D;&#x7684;&#x5E38;&#x8BC6;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x6709;&#x4E00;&#x79CD;&#x7279;&#x6B8A;&#x60C5;&#x51B5;&#xFF0C;&#x90A3;&#x5C31;&#x662F;&#x5982;&#x679C;&#x7ECF;&#x8FC7;&#x9003;&#x9038;&#x5206;&#x6790;&#x540E;&#x53D1;&#x73B0;&#xFF0C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x5E76;&#x6CA1;&#x6709;&#x9003;&#x9038;&#x51FA;&#x65B9;&#x6CD5;&#x7684;&#x8BDD;&#xFF0C;&#x90A3;&#x4E48;&#x5C31;&#x53EF;&#x80FD;&#x88AB;&#x4F18;&#x5316;&#x6210;&#x6808;&#x4E0A;&#x5206;&#x914D;&#x3002;&#x8FD9;&#x6837;&#x5C31;&#x65E0;&#x9700;&#x5728;&#x5806;&#x4E0A;&#x5206;&#x914D;&#x5185;&#x5B58;&#xFF0C;&#x4E5F;&#x65E0;&#x987B;&#x8FDB;&#x884C;&#x5783;&#x573E;&#x56DE;&#x6536;&#x4E86;&#x3002;</p>
<p>&#x8FD9;&#x91CC;&#xFF0C;&#x8FD8;&#x662F;&#x8981;&#x7B80;&#x5355;&#x8BF4;&#x4E00;&#x4E0B;&#xFF0C;&#x5176;&#x5B9E;&#x5728;&#x73B0;&#x6709;&#x7684;&#x865A;&#x62DF;&#x673A;&#x4E2D;&#xFF0C;&#x5E76;&#x6CA1;&#x6709;&#x771F;&#x6B63;&#x7684;&#x5B9E;&#x73B0;&#x6808;&#x4E0A;&#x5206;&#x914D;</p>
<h3 id="&#x9003;&#x9038;&#x5206;&#x6790;&#x5E76;&#x4E0D;&#x6210;&#x719F;"><a name="&#x9003;&#x9038;&#x5206;&#x6790;&#x5E76;&#x4E0D;&#x6210;&#x719F;" class="anchor-navigation-ex-anchor" href="#&#x9003;&#x9038;&#x5206;&#x6790;&#x5E76;&#x4E0D;&#x6210;&#x719F;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="&#x9003;&#x9038;&#x5206;&#x6790;&#x5E76;&#x4E0D;&#x6210;&#x719F;" class="plugin-anchor" href="#&#x9003;&#x9038;&#x5206;&#x6790;&#x5E76;&#x4E0D;&#x6210;&#x719F;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x9003;&#x9038;&#x5206;&#x6790;&#x5E76;&#x4E0D;&#x6210;&#x719F;</h3>
<p>&#x5173;&#x4E8E;&#x9003;&#x9038;&#x5206;&#x6790;&#x7684;&#x8BBA;&#x6587;&#x5728;1999&#x5E74;&#x5C31;&#x5DF2;&#x7ECF;&#x53D1;&#x8868;&#x4E86;&#xFF0C;&#x4F46;&#x76F4;&#x5230;JDK 1.6&#x624D;&#x6709;&#x5B9E;&#x73B0;&#xFF0C;&#x800C;&#x4E14;&#x8FD9;&#x9879;&#x6280;&#x672F;&#x5230;&#x5982;&#x4ECA;&#x4E5F;&#x5E76;&#x4E0D;&#x662F;&#x5341;&#x5206;&#x6210;&#x719F;&#x7684;&#x3002;</p>
<p>&#x5176;&#x6839;&#x672C;&#x539F;&#x56E0;&#x5C31;&#x662F;&#x65E0;&#x6CD5;&#x4FDD;&#x8BC1;&#x9003;&#x9038;&#x5206;&#x6790;&#x7684;&#x6027;&#x80FD;&#x6D88;&#x8017;&#x4E00;&#x5B9A;&#x80FD;&#x9AD8;&#x4E8E;&#x4ED6;&#x7684;&#x6D88;&#x8017;&#x3002;&#x867D;&#x7136;&#x7ECF;&#x8FC7;&#x9003;&#x9038;&#x5206;&#x6790;&#x53EF;&#x4EE5;&#x505A;&#x6807;&#x91CF;&#x66FF;&#x6362;&#x3001;&#x6808;&#x4E0A;&#x5206;&#x914D;&#x3001;&#x548C;&#x9501;&#x6D88;&#x9664;&#x3002;&#x4F46;&#x662F;&#x9003;&#x9038;&#x5206;&#x6790;&#x81EA;&#x8EAB;&#x4E5F;&#x662F;&#x9700;&#x8981;&#x8FDB;&#x884C;&#x4E00;&#x7CFB;&#x5217;&#x590D;&#x6742;&#x7684;&#x5206;&#x6790;&#x7684;&#xFF0C;&#x8FD9;&#x5176;&#x5B9E;&#x4E5F;&#x662F;&#x4E00;&#x4E2A;&#x76F8;&#x5BF9;&#x8017;&#x65F6;&#x7684;&#x8FC7;&#x7A0B;&#x3002;</p>
<p>&#x4E00;&#x4E2A;&#x6781;&#x7AEF;&#x7684;&#x4F8B;&#x5B50;&#xFF0C;&#x5C31;&#x662F;&#x7ECF;&#x8FC7;&#x9003;&#x9038;&#x5206;&#x6790;&#x4E4B;&#x540E;&#xFF0C;&#x53D1;&#x73B0;&#x6CA1;&#x6709;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x662F;&#x4E0D;&#x9003;&#x9038;&#x7684;&#x3002;&#x90A3;&#x8FD9;&#x4E2A;&#x9003;&#x9038;&#x5206;&#x6790;&#x7684;&#x8FC7;&#x7A0B;&#x5C31;&#x767D;&#x767D;&#x6D6A;&#x8D39;&#x6389;&#x4E86;&#x3002;</p>

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